45251551 has 4 divisors (see below), whose sum is σ = 45415192. Its totient is φ = 45087912.

The previous prime is 45251539. The next prime is 45251573. The reversal of 45251551 is 15515254.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 45251551 - 2⁵ = 45251519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45251651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81405 + ... + 81958.

It is an arithmetic number, because the mean of its divisors is an integer number (11353798).

Almost surely, 2^45251551 is an apocalyptic number.

45251551 is a deficient number, since it is larger than the sum of its proper divisors (163641).

45251551 is a wasteful number, since it uses less digits than its factorization.

45251551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163640.

The product of its digits is 5000, while the sum is 28.

The square root of 45251551 is about 6726.9273074711. The cubic root of 45251551 is about 356.3508697234.

It can be divided in two parts, 452 and 51551, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 45251551 in words is "forty-five million, two hundred fifty-one thousand, five hundred fifty-one".